Ski-Doo 2005 MACH Z, Shop Manual

Page: 135 / 343

Section 04 ENGINE MANAGEMENT (SDI)
Subsection 01 (OVERVIEW)
FUEL DELIVERY SYSTEM
Diaphragm Fuel Pump
A conventional diaphragm fuel pump is used to
supply fuel to the electric fuel pump reservoir lo-
cated inside fuel tank. This reservoir is the fuel
supply for the electric fuel pump. This system
allows a more consistent fuel delivery under ex-
treme riding angles and when the fuel tank level
is low, which increases the fuel range per tank.
NOTE: A bypass hole in the upper section of the
pump reservoir allows fuel to enter or exit the
reservoir depending of the conditions.
A33C5OA
3
4
2
1
1. Diaphragm pump
2. Fuel pick-up
3. Pump reservoir
4. Electric fuel pump
Electric Fuel Pump and Fuel
Pressure Regulator
They provide fuel pressure and flow rate to the
system.
The fuel pump module is located inside the fuel
tank. The module includes the fuel pump and the
fuel pressure regulator. The fuel pump inlet in-
cludes a filter.
A33C5PA
The fuel pressure regulator controls the pressure
in the system and allows the excess of fuel to
return to the fuel tank. The fuel pressure regulator
regulates the fuel pressure at 400 kPa (58 PSI).
Fuel Rail
The fuel rail is a small tube on which the four in-
jectors are mounted. It ensures at all times that
enough fuel at the right pressure can be delivered
to the fuel injectors. The fuel rail is fed by the fuel
pump module.
Fuel Injectors
Fuel injectors (two different types per cylinder) are
used to inject fuel into the transfer port of cylinder.
– Outer injectors are responsible for idle speed
and part load condition.
– Inner injectors will be activated at 6500 RPM for
wide open throttle condition.
A35C4LA
2
1 1
1. Outer injectors (blue)
2. Inner injectors (brown)
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